Dredge-box.



No. 794,958. PATENTED JULY 18, 1905. G. M.'SYMONDS.

' DREDGE'BOX.

APPLIGATION FILED FEB. 26. 1904.

Zia/Mr:

Patented July 1e, 1995.

UNITED STATES PATENT OEErCE.

CLARENCE M. SYMONDS, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO AMERICAN CAN COMPANY, OF NEV YORK, N. Y., A COR NEV JERSEY.

DREDGE-BOX.

SPECIFICATION forming part of Letters Patent No.

794,955, dated July 18, 1905.

Application filed February 26, 1904. Serial No. 195,436.

To L7/Z whom it may concern:

Be it known that I, CLARENCE M. SYMoNDs, a citizen of the United States, residing in San Francisco, in the county of San Francisco and State of California, have invented a new and useful Improvement in Dredge Boxes, of which the following is a specification.

My invention relates to improvements in dredge-boxes.

The object of my invention is to provide a dredge box or can of a simple, eflicient, and durable construction, composed of few parts and capable of being cheaply manufactured.

My invention consists in a dredge box or can having a perforated top or cover furnished with an integral central raised pivot portion or boss and also with integral lips or tongues adjacent to said pivot-boss, in combination with a4 rotary perforated closing-plate having a central opening to receive the pivot boss or projection on the top or cover, and through which central opening the lips or tongues on the top or cover are inserted and turned or clenched down to rotatably secure the perforated closing plate to the top or cover. By this means the rotary closing-plate and the perforated top or cover are operatively combined and secured together without making a central opening in the top or cover requiring to be closed.

My invention also consists in the novel construction of parts and devices and in the novel combination of parts and devices herein shown and described.

In the accompanying drawings, forming a part of this specification, Figure 1 is a perspective View of a dredge-box embodying my l invention. Fig. 2 is a central vertical longitudinal section. on line 3 3 of Fig. 2, and Fig. I is a bottom or reverse view of the perforated top or cover of the box or can.

In the drawings, A represents a dredge box or can having a perforated top or cover B, the perforations b therein being arranged in radial rows. The cover B has a circular countersink or depressed portion Z2 to receive the rotary closing-plate D. The top or cover B is also provided with acentral integral raised Fig. 3 is a vertical section' boss or pivot portion 62 and with two integral vlips or tongues 3 diametrically opposite each other and adjacent to the pivot-boss Z22.

rPhe perforated rotary closing-plate D has its perforations Z arranged in radial rows, and it is provided with a central pivot-opening d, through which the pivot-boss on the cover B projects, and through which also the lips or tongues o are passed and then turned or clenched down flat upon the rotary closing-plate to rotatably secure said plate and the coverl B together. The perforated rotary closing-plate D is also provided with one or more, preferably four, upturned projections d2 at its rim or periphery to serve as handles or thumb-pieces for turning the rotary closing-plate.

The central pivot-boss b2 and the clenching lips or tongues 3 on the cover B may be stamped up or formed at the same time that the perforations b are made and by the same stroke of the press, and the rotary closingplate and cover may be very quickly assembled and secured together by simply inserting the lips or tongues 7) through the central pivot-opening in the rotary closing-plate and then turning or clenching these lips or tongues down. I

I disclaim as not of my invention the dredgebox shown and described in the Villiams patent, No. 702,169, of June 10, 1902, and also that shown and described in the Williams patent, No. 695,424, of March 11, 1902. In my invention the smooth and substatnially circular pivot-boss on the perforated top fitting in the circular hole of the rotary closing-plate forms a smooth round pivot-bearing for the rotary closing-plate to turn upon, while the clenching lips or tongues 3 serve to hold the two parts together without interfering with the rotary movement of the closingplate. In the dredge-box of the Williams patent, No. 702,169, there is no central pivot-boss either on the perforated top or on the rotary closing-plate, and the closing-plate turns on a sharp-edged skeleton polygon formed by the live triangular lips CZ, which are punched out of and formed on the rotary closing-plate and inserted through the hole in the perforated PORATION OF top of the can or boX, and consequently this Williams dredge-box has no smooth round bearing for the closing-plate to turn upon as a pivoti In the dredge-box of the Williams patent, Nos 695,424, the perforated top of the can or box has no clenching lips or tongues, and it is attempted to secure the rotary closing-plate and top together by swelling out, riveting, or upsetting the central pivot-boss on the perforated top, which is inserted through the hole of the rotary closing-plate over the surrounding edge of the rotary closing-plate hole, an operation which is likely to so tighten the parts that the pivot-boss on the perforated top will not any longer notatably or properly fit the hole in the rotary closingplate. My invention thus differs materially in principle as well as in construction from each and both of these Williams patents.

I claim* In a dredge-box, the combination of a per forated top provided With clenching lips or tongues, and a perforated rotary closing-plate having a central opening through Which the said lips are passed upward and then bent out- Ward upon the face of the closing-plate to hold the same against the cover, said top also having a raised central pivot-boss adapted to be formed at and by the saine operation Which forms the said lips, and situated in said central opening and adapted to give, independent of the lips, a smooth circular bearing for the rotation of the closing-plate, substantially as set forth.

CLARENCE M. SYMONDS.

Witnesses: Y

ALFRED A. ENQUrs'r, HENRY GOODMAN. 

